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# MCP4728 dac code
#
# Copyright (C) 2018 Kevin O'Connor <kevin@koconnor.net>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
from . import bus
class mcp4728:
def __init__(self, config):
self.i2c = bus.MCU_I2C_from_config(config, default_addr=0x60)
scale = config.getfloat("scale", 1.0, above=0.0)
# Configure registers
for i, name in enumerate("abcd"):
val = config.getfloat(
"channel_%s" % (name,), None, minval=0.0, maxval=scale
)
if val is not None:
self.set_dac(i, int(val * 4095.0 / scale + 0.5))
def set_dac(self, dac, value):
self.i2c.i2c_write(
[0x40 | (dac << 1), ((value >> 8) & 0x0F) | 0x80, value & 0xFF]
)
def load_config_prefix(config):
return mcp4728(config)
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